In medium bowl, combine strawberries and sugar; mix well. Let stand at room temperature for 10 minutes.
Meanwhile, cut pan of brownies in half lengthwise, forming 2 long strips. Cut each strip into 3 pieces.
To serve, peel and slice banana. Add to strawberry mixture; toss gently. Place brownies on individual dessert plates. Top each with 1/3 cup fruit mixture and 1/3 cup sorbet. Drizzle 1 tablespoon chocolate syrup over each serving.