My daughter calls this "Scoop scoop". I just get two containers and fill one with dried beans, give her a measuring cup and let her scoop the beans back and forth. You could use uncooked rice, noodles really anything you want. Just make sure that it won't kill your kid if they eat it.....that would be bad. It's a great sensory game for the kids to play and it can entertain them for quite a while too.
WARNING: This will always happen when they're sick of the scoop game. So be prepared to sweep up the mess. That's why I stopped using rice and moved onto beans. They are much easier to clean up. For me scoop scoop entertains her long enough for the mess to be worth it.