Cook lasagna noodles according to package directions.
Place dried tomatoes and garlic in a bowl. Carefully add 1 cup boiling pasta water; set aside.
Cut sausage in half lengthwise and slice into large pieces. In a 12-inch skillet cook sausage in hot oil over medium-high heat until lightly browned and heated through, turning occasionally. Add tomato mixture. Cook, uncovered, for 2 minutes. Stir in spinach, salt, and pepper. Cover and remove from heat.
Cut cooked lasagna noodles in half. To serve, layer noodles and sausage mixture onto individual plates. If desired, serve with Parmesan cheese.