Cook noodles according to package directions. Meanwhile, crumble sausage into a large skillet. Cook over medium heat until meat is no longer pink; drain. Add pizza sauce., Drain noodles and add to skillet; toss to coat. Transfer half of the noodle mixture to a greased 13x9-in. baking dish. Layer with half the pepperoni and half the cheese. Repeat layers. Bake, uncovered, at 350° for 20-25 minutes or until cheese is melted.