Prepare grill to high heat. Pat scallops dry with a paper towel. Sprinkle half of the jerk seasoning evenly over scallops.

Coat scallops with cooking spray. Place scallops on grill rack; grill 3 minutes on each side or until done. Remove scallops.

Add pineapple to grill rack; grill 2 minutes on each side. Remove pineapple from grill; chop pineapple.

Combine salad greens, lettuce, pineapple, and avocado in a large bowl. Combine lime juice, olive oil, and remaining spice in a small bowl. Add dressing to salad, and toss well. Place 1 1/2 cups salad into each bowl.

Arrange scallops over salad and serve.