Richard Sherman -- DJ's Vegas Bikini Rager ... With Brody Jenner

Seems Richard Sherman's elbow's all better -- 'cause the guy was healthy enough to get on the 1s and 2s at a crazy pool party in Vegas this weekend ... with his pal Brody Jenner!

The two -- along with Richard's teammate Kam Chancellor -- took over the DJ booth at Tao Beach at the Venetian ... providing the beats as a bunch of young, hot, barely-dressed (mostly drunk) people partied their faces off.

Later that night, the gang took the party to Tao Nightclub ... where Jenner has a DJ residency.

We're told the guys were cool, took pics with tons of fans -- and gambled a little bit later that night.

Thanks to our friends at SpyOnVegas.com for the pics.