120V? 240V?
120V can already be done natively with sense using a Belkin Wemo Insight Smart Switch or a TP-Link Kasa HS300 or if you can find one, a TP-Link Kasa HS110.
If 240V, Search around here as I’m pretty sure others have devised a way to do this. However, you may want to check out this thread: SenseLink - TP-Link Smart Plug Emulation - #14 by KHouse75