Line a 15x10x1-in. baking pan with foil; grease the foil. Set aside. In a small bowl, combine the brown sugar, pineapple juice and soy sauce. Place salmon skin side down on prepared pan. Spoon sauce mixture over fish.
Bake, uncovered, at 350° for 20-25 minutes or until fish flakes easily with a fork, basting frequently with pan juices.