Place sardines in a food processor; puree until smooth. Add eggs, bread crumbs, paprika, turmeric, ginger, garlic powder, onion powder, salt, and black pepper. Pulse briefly until well-combined. Shape mixture into small balls.
Heat oil in a large skillet over medium heat. Add onion and garlic; cook and stir until fragrant, about 5 minutes. Stir in tomatoes, coriander, and cumin. Reduce heat, cover, and simmer sauce until flavors combine, about 15 minutes. Stir in meatballs and simmer until heated through, about 5 minutes.
