Cook pasta according to package directions, omitting salt and fat. Drain; rinse with cold water, and drain. Place in a medium bowl. Combine sour cream and next 4 ingredients, stirring well. Cover and set aside.
Coat a small nonstick skillet with cooking spray. Place fillet in skillet; pour wine and water over fillet. Bring to a boil; cover, reduce heat, and simmer 8 minutes or until fish flakes easily when tested with a fork. Remove from liquid, discarding liquid. Let cool slightly. Remove and discard skin from fillet; cut fillet into bite-size pieces, and place in a medium bowl.
Add cooked pasta, onion, parsley, and tomato, tossing gently. Spoon sour cream mixture over salmon mixture; stir gently. To serve, spoon salmon mixture evenly onto 2 lettuce-lined salad plates.