Hi Kachupi welcome
What kind of hamster is Hamtaro?
Cute name I am curious about its meaning?
Can I ask firstly what kind of sand you are using?
Hamsters digging in sand and tossing it all about is totally normal; that's what they are supposed to do. You may need a different container to keep the sand in. Can you take a picture of your set up? About the Ostrich pose I have no idea. If you can gEt a picture of that also it may help. But I think if he is otherwise healthy I wouldn't worry too much, maybe keep an eye on him, it's probably something only a hamster knows.