Prepare ingredients: Peel and rough dice sweet potatoes into 1-inch pieces. Peel carrots and cut into ½-inch coins. Slice celery into ½-inch pieces. Dice onion and mince garlic. Peel shrimp and cut into 1-inch pieces.
Add olive oil to a large pot over medium-high heat. Add prepared carrot, celery and onion. Cook for 7-10 minutes, until vegetables are soft and onion is translucent. Add garlic and cook for 1 more minute. Add diced potatoes and cover with 4 to 5 cups of vegetable broth, just covering potatoes. Bring to a boil.
Once potatoes are boiling, add dried thyme, salt and pepper. Reduce to a simmer and cook until potatoes are soft, about 18 to 20 minutes. Use a potato masher to break up potato chunks, which will thicken the chowder. Stir in coconut milk and return to a simmer.
Add diced shrimp and drained, canned clams. Cook for another 5 minutes, until shrimp is cooked through but not overdone. Taste and adjust seasoning, as needed. Serve.