In the bowl of a food processor, combine the coconut milk, peanut butter, red curry paste, hoisin sauce, brown sugar, sriracha, soy sauce, and ginger. Pulse to combine until smooth. Season with more soy sauce and sriracha. Set aside.
Heat the oil in a large pan or wok over medium-high heat. Add the tofu and sweet potatoes to the pan and sauté, stirring frequently, until the sweet potatoes are tender, 8 to 10 minutes. Stir the sugar snap peas into the pan and sauté until bright green, 1 to 2 minutes. Add in the noodles and sauté until heated through.
Stir the sauce into the pan and cook for a few minutes to heat through, stirring frequently. Serve with more hot sauce at the table.