Bring a large pot of lightly salted water to a boil. Cook tortellini in the boiling water until tender yet firm to the bite, 6 to 7 minutes. Drain well and transfer to a large bowl.
Add tomatoes, cucumbers, bell peppers, red onion, Kalamata olives, and feta cheese. Add salad dressing and mix thoroughly.
Chill in the refrigerator for 2 hours before serving.