In a medium bowl, combine the tuna, salt and pepper, and 1 tablespoon of the soy sauce, and combine gently. Divide the mixture into 4 equal parts and shape each into a patty. Set aside.
In a small bowl, combine the sour cream, mayonnaise, and wasabi paste. Stir to combine thoroughly and set aside.
Spray a large nonstick skillet with nonstick cooking spray and heat over medium-high heat. Add the tuna burgers and sear for 2 minutes on each side. Remove from the heat, add the soy sauce, return to the heat, and sear for 1 more minute per side.
Place each on the bottom half of each roll, top with a tablespoon of dressing, and serve.