How do I reconnect Sonos after changing to a new wifi router?

I'm having a similar issue.  
I connected my play 1 to my new router via Ethernet cable, then opened the android app, then looked up settings/advanced settings/wireless setup. Then choose my router and put in the password, and bingo.

Alright guys I figured it out if anyone is having problems now or in the future. So I just moved and am using a whole new router and modem etc... It wouldnt connect and I was getting all of the same issues. First thing first, plug a sonos into your router, then unplug the sonos, count to 5 and replug into the socket. Once i did this my controller (iphone 6 app) told me I was connected, but this is only through the hardwire. If you notice there was a message saying go to settings -> advanced settings -> wireless setup... Only you cant access it unless you are connected. So once ur connected via the hardwire, do the advanced settings wireless setup process and have your new network and password and you are golden. Test it by playing a song and unplugging the cable once it begins to play. Your sonos will stop, but then go back to your music re-select your song and it will begin to play wirelessly once again. Hope this helps to all in the past and future who have encountered this!

Alright guys I figured it out if anyone is having problems now or in the future. So I just moved and am using a whole new router and modem etc... It wouldnt connect and I was getting all of the same issues. First thing first, plug a sonos into your router, then unplug the sonos, count to 5 and replug into the socket. Once i did this my controller (iphone 6 app) told me I was connected, but this is only through the hardwire. If you notice there was a message saying go to settings -> advanced settings -> wireless setup... Only you cant access it unless you are connected. So once ur connected via the hardwire, do the advanced settings wireless setup process and have your new network and password and you are golden. Test it by playing a song and unplugging the cable once it begins to play. Your sonos will stop, but then go back to your music re-select your song and it will begin to play wirelessly once again. Hope this helps to all in the past and future who have encountered this!
Great directions, and exactly the right thing to do if you replace the router and were running Sonos wirelessly. You could also set the new routers wifi name and password to be the same as the old one and Sonos would find it. 

Alright guys I figured it out if anyone is having problems now or in the future. So I just moved and am using a whole new router and modem etc... It wouldnt connect and I was getting all of the same issues. First thing first, plug a sonos into your router, then unplug the sonos, count to 5 and replug into the socket. Once i did this my controller (iphone 6 app) told me I was connected, but this is only through the hardwire. If you notice there was a message saying go to settings -> advanced settings -> wireless setup... Only you cant access it unless you are connected. So once ur connected via the hardwire, do the advanced settings wireless setup process and have your new network and password and you are golden. Test it by playing a song and unplugging the cable once it begins to play. Your sonos will stop, but then go back to your music re-select your song and it will begin to play wirelessly once again. Hope this helps to all in the past and future who have encountered this!
I was having the same issues when I upgraded my router to a Linksys WRT1900ac. I tried your directions and it works! I had to reset my controllers first before attempting to connect both of my players through the ethernet cable. After I was hardwired, I disconnected the power plug from my players, replugged it, waited a minute or so, then my Sonos controller displayed that I was connected, I then went to the Settings>Advanced Settings>Wireless Setup and updated my WiFi info. I played a song, disconnected the ethernet cable, it stopped playing, then I pressed "Play" again and that was it. So easy. Thank you so much!

I will be back to this thread if the problem arises again, hopefully not.  

My 2cents: When you select WIFI in the controller app, it finishes with the message: You can now remove the network cable. This should be renamed into: you MUST remove...

Neither of the options discussed here have worked for me. Recently replaced my router, sound was still coming through from my T.V. but could not connect through any controllers (iphone5s, iphone6, laptop). I've reset all the controllers and I get the message that "no existing system can be found".

I have a BOOST hard wired to my router. I've toggled the power to it several times to no avail. I've directly hard wired my PLAYBAR to the router and toggled the power, with nothing happening as well. (All of this was done with both original controller and reconfigured one).

I've factory reset both the BOOST and the PLAYBAR, and have tried to setup as a new SONOS system. The BOOST will not connect... Nor do I get any sound from my T.V.

It's a sad, quiet house.

Just got a new router. My Play: 3 doesn't play anymore because it can't find my wireless network.

My controller app tells me to go to settings > advanced settings > wireless setup.

Only, when I'm not connected to my router via ethernet, I can't do anything in the app, and when I am wired, and I go to settings, there isn't actually an option "advanced settings". And no "wireless setup" either.

Now what?

With the play:3 wired you can see it and connect to it? If so, check in settings, about my Sonos system and tell us what versions are installed on the controller and the play:3. You only lose the advanced settings when you have a version mismatch.

For a bonus point I'm going to say that you're using an iPhone controller and you've signed up to the beta program.

I can connect to the play:3 when it's wired. I have version 5.5 on my controller and 6.0 on the play:3