It seems a bit gimmicky to me unless you have a physical limitation that prevents manual sifting, but there are a few options if you google "electric sifter." Here's one on Amazon.

Alternatively, if you were feeling DIY, I'm sure you could attach a low speed drill, electric screw driver, or other electric motor to a crank sifter. You could also set up something like a drill chuck with a stick in it to repeatedly whack a sieve. I'd still think that unless you were doing this at a large scale, the amount of time to diy or to purchase, set up, and clean an electric sifter would be greater than the time saved, but that's just my take. Good luck!