No. Boxing gloves (or any third-party motion accessory) cannot be used with SmackDown vs. Raw 2009 on Wii.
The game is programmed exclusively for the Wii Remote + Nunchuk combination. It reads specific accelerometer/IR data from those devices. Boxing gloves lack the necessary sensors, button mappings, and Bluetooth protocol to communicate with the game engine.
Stick to the Wii Remote/Nunchuk for the intended experience.