Heat grill to medium-high. In a small bowl, combine the butter, garlic, and thyme. Set aside.
Season the pork with ½ teaspoon each salt and pepper and grill until cooked through, 6 to 7 minutes per side.
Meanwhile, divide the tomatoes between 2 pieces of heavy-duty foil and season with ½ teaspoon salt and ¼ teaspoon pepper. Close to form 2 pouches.
Grill the pouches alongside the pork, gently shaking occasionally, for 8 minutes.
Top the pork chops and tomatoes with the garlic butter just before serving.