Bring a large pot of lightly salted water to a boil; cook rotini at a boil until tender yet firm to the bite, about 8 minutes; drain and rinse with cold water until cool.
Combine pasta, salami, green bell pepper, red bell pepper, onion, salad dressing, olives, and mozzarella cheese in a large bowl. Mix dry salad dressing into pasta; sprinkle with Parmesan cheese.
