Quick answer, yes. Now for the setup. If the computer head phones have the standard 3.5mm headphone jack, you will need a female RCA Red and White to 3.5mm cord.
Like here- http://www.amazon.com/inches-Stereo-Splitter-3-5mm-Adapter/dp/B0009JFF7A/ref=sr_1_1?s=electronics&ie=UTF8&qid=1346003237&sr=1-1&keywords=rca+female+to+3.5mm+female
. If you already have to sound going to AV/RCA, then plug the red and white cords from the PS3, into the corresponding color coated female jacks. Then plug your headphones into the 3.5mm female slot, and you're good to go.