Cox, 46, and Hopkins, 40, were seen running in the waves with the actress' 6-year-old daughter Coco.
Last month, the "Cougar Town" actors were spotted holding hands after the cameras stopped rolling, sparking rumors that their romance might extend beyond the small screen.
The actress' representative denies that there is any romance between the two, telling People, "The relationship is strictly platonic and they are away with a group of friends on vacation."
A source from the "Cougar Town" set also insisted there is nothing between Cox and Hopkins besides friendship, "Courteney and Josh are great friends. There's definitely nothing going on there."
Cox is currently promoting her upcoming movie, "Scream 4" with David Arquette, nearly 6 months after the couple separated. Cox reprises her role of journalist-turned author Gale Weathers and Arquette plays her husband, police officer Dwight "Dewey" Riley, the movie is set for release on April 15.
The couple met on the set of the original 1996 horror film, "Scream." Arquette, 39, and Cox married in June 1999 and welcomed their daughter Coco in 2004. They announced in October 2010 that they had agreed to a trial separation.
"Cougar Town" returns on Monday April 18th after "Dancing With The Stars" before moving back to its regular time, Wednesdays at 9:30 p.m. ET on April 20th. The "Cougar Town" season 2 finale is set in Hawaii and will air on May 25 with a one-hour special episode. The show has been renewed for a third season.
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