Using Sonos without Wifi

I have my sonos currently setup on my wireless internet network and it's working fine but the signal drops when too many devices connect to the internet. I am thinking of connecting the sonos systems to a router that doesn't have any internet connection running but will be able to create a network for sonos exclusively. I am wondering if this will be possible if that router does not have any internet connection?

Please note: I am aware of Sonos Boost and what it can do to solve my problem but what I am trying to achieve is a dedicated sonos wireless network running with the help of a router without internet connection.