Sprinkle salmon with salt, garlic salt and pepper. Heat oil in a large skillet over medium-high heat; add salmon skin side up and cook 3 minutes. Turn fish and cook an additional 4 minutes or until fish flakes easily with a fork. Remove from heat and keep warm.
In a large saucepan, bring stock to a boil. Stir in couscous. Remove from heat; let stand, covered, until stock is absorbed, about 5 minutes. Stir in tomatoes, green onions and goat cheese. Serve with salmon.
