Not sure if there is a place Tiger fans gather there, but Liberty Taproom on the northern end of Myrtle Beach (76th ave N so it's close to North Myrtle) is a great place to watch a football game. They have good food, good beer, and they'll use their projector and big screen for the biggest game that is on.
I suggest getting there a little before kickoff and getting one of the tables in the bar that are front and center. I'm sure there will be other fans there, I've always run into a few when I happen to be there for a game.