Spoon whipped topping into a large bowl.
Combine coffee liqueur and chocolate syrup, and fold into whipped topping. Stir in half of chopped wafer bars.
Arrange ice cream sandwiches in an 11 x 7- inch baking dish. Spread whipped topping mixture evenly over ice cream sandwiches. Sprinkle with remaining chopped wafer bars. Cover and freeze at least 2 hours or until firm. Cut into squares.