Fill a large pot with lightly salted water and bring to a rolling boil; stir in tortellini and return to a boil. Cook uncovered, until tortellini float to the top and the filling is hot, about 3 minutes. Rinse under cold water; drain.
Combine tortellini, tomatoes, spinach, cheese, and olives; add enough salad dressing to coat. Toss; season with salt and black pepper.
