After me NO, I connected my sonos Beam via HDMI

The projector has Google TV built in and two HDMI connections - I connected Google Chromecast (because the built-in Google TV in the projector doesn't have Netflix) and Apple TV to it. If Sonos also has an HDMI adapter, it should work...

Yes, this works very well via optical cable to the soundbar

Thanks for the information. How can I connect the Sonos Era100? Is there a distributor that I can plug into the projector?

I use the projector at trade fairs. I can't tell you anything about it...