Heat broiler. Place salmon and tomatoes, cut-side up, in a broilerproof roasting pan or on a rimmed baking sheet.
Drizzle with oil and season with ¾ teaspoon salt and ¼ teaspoon pepper. Sprinkle salmon with paprika. Scatter thyme and garlic over the top.
Broil until salmon is opaque throughout and tomatoes are tender, 8 to 10 minutes.