Cook sausage links according to package directions; drain, cut into ¼-inch slices.
In a large bowl, combine sausage slices, pasta, pasta sauce, water, basil, garlic, Parmesan cheese, pepper and mix well.
Spoon mixture into a greased 9-in. x 13-in. x 2-in. baking dish.
Arrange garlic bread slices on top of meat mixture.
Sprinkle evenly with mozzarella cheese.
In a small bowl, dip tomato slices into olive oil.
Place one slice of tomato on each piece of bread.
Bake uncovered, at 400°F for 25-30 minutes or until heated through. Remove from oven and let rest for 5 minutes before serving.
Garnish with basil leaves. Serve.