Heat oil in a large skillet over medium-high heat. Add sausage cook, flipping occasionally, until browned on all sides, about 4 to 6 minutes. Add onion, bell pepper, celery, and garlic, season with a pinch of salt and pepper. Cook, stirring occasionally, until onion begins to soften, 3-4 minutes.
Stir in paprika; cook until fragrant, about 1 minute.
Add tomatoes, rice, and 3 cups water to skillet, cover, and simmer over medium heat until rice is cooked and has absorbed all water, about 15 minutes. {cooking time will depend on rice cooking instructions}
Add shrimp to skillet, and cook, covered, until shrimp are opaque throughout, 3 to 4 minutes.
Remove from heat, taste and season with salt and pepper, as desired.
Serve garnished with scallions.