It's pretty common these days for good quality projectors to have bluetooth but you would be restricted to stereo at best due to bluetooth not supporting Dolby/DTS surround sound formats and there is a fair chance that you would encounter sync/lag in the sound.
If your gunning for anything like a decent home theater sound from your setup your could look at mounting a soundbar to the wall or biting the bullet and going traditional speakers and amp route - for something compact and relatively discrete I would recommend the Bowers and Wilkins MT-50 package. The speakers can be mounted on dedicated stands that the wires can be fed through and then run under your carpet (assuming you have any!), the subwoofer is very compact but not wireless. The new SVS 3000 Micro sub with their wireless adapter would be an excellent alternative if wireless sub was a must.