While flipping through the Core Book (2nd ed, Revised & Expanded) the other day, I realized that I did not see any Force power or skill relating to throwing a lightsaber as a ranged attack. I haven't gotten the chance to flip through anything else yet, but I would think it would be in there. I googled the crud out of it, but I did not find any links that clued me into where – or even if – WEG' Star Wars has this.
Seems like Telekinesis is what you're looking for (instead of those droids.) To quote the book (p.151, Core SW d6, 2nd Ed., I'm not sure if it's revised or not, though):