In 12-inch skillet over medium-high heat, cook sausage until well browned on all sides, turning occasionally. Remove sausage to plate.
In drippings remaining in skillet over medium heat, cook yellow peppers, green peppers and onion until tender-crisp, stirring occasionally.
Preheat oven to 450° F. Cut sausages into thin slices. Grease 12-inch pizza pan. Press pizza dough into pan. Brush with olive oil. Arrange half of shredded cheese over pizza dough. Top with sautéed vegetables and sliced sausages. Arrange sliced tomatoes over vegetables. Sprinkle with remaining cheese.
Place pizza in oven. Cook for 15 minutes or until cheese is melted and crust is browned and golden.