Heat grill pan to 375˚F to 400˚F or a pan to medium-high heat. Add oil. Once hot, add the garlic and scallops to pan, then add shrimp and cook for 2 to 3 minutes. Add crab meat to pan to warm through, then add cheese slices, season with salt and pepper, and stir to combine.
Assemble sandwich on the toasted roll using shredded lettuce, chipotle mayo, and the seafood mixture.
