Which speakers do you have?

The only speaker in the Sonos lineup with Bluetooth connectivity is the Sonos Move. So you can’t wirelessly connect any other speaker directly to the projector.

If you are ok with using cables, the Play 5 as well as the various soundbars (Playbar, Playbase, Beam and Arc) have lineouts and can be connected to the projector that way.

A third option is using an Apple TV and then airplay to the Sonos speakers. The more recent speakers support airplay 2.

This PJ has optical out, so will work with the Playbar/Playbase/Beam/AMP/Arc and will get you DD 5.1.

You can use the ARC HDMI input to connect a beam or Arc and then wirelessly sub and rears for 5.1.

If you connect a Firestick on the other HDMI ans have an Arc you can get Atmos content for Disney +, Prime and Tidal.

This projector does not have any HDMI-ARC ports by my reading of its specifications so optical is the only method to connect it to a Sonos HT device.

The HDMI on the side in my Projector is ARC. It works perfectly with my Sonos equipment and I have Atmos.