Currently, the only way to move the Sub is to unbond it from its current ‘room’ and add it to the other. Losing any TruePlay tuning you may have done, incidentally.
If you check the threads in the forum, you’ll find it has been a frequent feature request, but so far there has been no indication that Sonos has any intention of supplying such a feature.
I may have figured a solution for this. Might work for others.
Room #1 as follows
Connect TV to Sonos amp with hdmi-ARC
Wired speakers connected to Sonos amp, fronts
Connect surrounds, 2xPlay 1, to Sonos amp
Connect Sonos sub to Sonos amp
Room #2 as follows
Sonos Playbar connected to TV with optical cable
Now if i want to listen to music with my wired speakers I can just select room #1 and have surround volume set to -15 and ambient for music
When I want to watch a movie I use Sonos amp, the playbar will actually still work for me in this set up if I have room#2 on
I can watch straight TV with only playbar if room #1 is set to music, but paused. I have had to turn the Sonos Amp setting to turn off TV Autoplay
I can't seem to get just TV with Playbar and SUB but it is only usually for movies that I want the big home theatre sound
Still waiting for the option to have SUB bonded to two devices as I don’t listen to music and watch movies at same time.