Bake the cake according to the package directions, then let it cool.
Once the cake has cooled, use the handle of a wooden spoon or the wide end of a chopstick to poke rows of holes in the cake. You want the holes to be wide enough to allow the thick strawberry sauce to drip into them.
Top the cake with the strawberry pie filling and use a rubber spatula to spread it over the cake and gently push the glaze into the holes.
Spread the whipped topping over the cake.
Decorate as desired with sliced or whole strawberries. Serve additional sliced strawberries on the side, if desired.
You can serve this cake immediately, or store it in the refrigerator for up to 3 days.