The best way that has worked for me is....get a large piece of egg crate(light diffuser) HomeDepot..$7-11, an old window screen...I have actually used one from my windows...didn't tell the wife...the just poured out enough to work with, placing the screen on top of the egg crate for support...then just run a stream of water through it ....moving it around some...once rinsed, scoop it up and I to a bucket....a little tedious but very affective.
Another way is to fill a bucket about 1/3, immerse a running hose into the sand and careful to not blow the sand out of the bucket, run the water til it runs clear.
I don't like this method because all the finer sand is still mixed in. I like the way a screen makes all the sand uniform in size.