Bring a large pot of lightly salted water to a boil. Place pasta in the pot, cook for 7 to 9 minutes until al dente, drain.
Preheat the grill. Season steak with garlic powder, salt and pepper; rub with olive oil. Place steak in a baking dish and grill 5 minutes on each side, or to desired doneness. Slice diagonally into thin strips.
In a bowl, toss the cooked tortellini, lettuce, olives, croutons, tomatoes and dressing. Top with steak strips to serve.