Can sand be compress

No, sand cannot be compressed due to the fact that it is a solid. When you have a large number of sand in a container, if you pour it, it will flow like water. Most people get confused over that and believe it reacts in the same manor as water (liquid).

However, sand is a very small and weak. It can get broken if you compress it. When you put a lot of weight onto a rock, it will break down into smaller objects, the same happens with a sand grain.