Randy Moss is Playin' Football Again ... Kinda

With rumors swirling that he'll start training with Tom Brady, Randy Moss picked up the pigskin this weekend ... for a pickup beach game in St. Lucia.

Turns out, Moss is running BodyHoliday's WellFit Families fitness retreat in the Caribbean -- leading activities like beach football, rock climbing and archery.

While the NFL legend didn't exactly shine during the football game (there's a reason he didn't play QB in high school) ... he killed it with the bow and arrow.

We're told Randy also led the groups in bike rides, sailing courses, cooking classes and abseiling adventures down waterfalls.