Two ways I know of to accomplish what you want, both courtesy of @bravenel.
The first would be to add a virtual switch and this smartapp. Configure the app to link the virtual switch to your physical lamp switch. Then, in Smart Lighting, configure it to turn on/off the virtual switch instead of the real one.
The second way is to just abandon Smart Lighting altogether, and use Rule Machine (no virtual switch required). The choice comes down to your personal preference (i.e., do you prefer a building block, modular approach or an all-in-one solution).