Heat gas or charcoal grill. Cut 18x12-inch sheet of heavy-duty foil; place on large cookie sheet. Spray foil with cooking spray. Unroll dough onto foil. Starting at center, press out dough into 14x10-inch rectangle. Spray dough with cooking spray.
Turn dough rectangle upside down directly onto grill rack; peel off foil, and return foil to cookie sheet, sprayed side up. Place rack of dough on gas grill over medium-low heat or on charcoal grill 4 to 6 inches from medium-low coals. Cook uncovered 2 to 4 minutes or until bottom is light golden brown. (Watch carefully to prevent burning.) With wide metal pancake turner, turn crust over. Cook 1 to 2 minutes longer or until bottom is set but not brown. Carefully remove from grill; place browned side up on foil. Close grill.
Top crust evenly with pizza sauce; sprinkle with cheese. Top half of the pizza with pepperoni.
Slide pizza from foil onto grill. Cover grill; cook 2 to 4 minutes longer or until crust is golden brown and cheese is melted.