So for this scene I need to spread glass fragments all over the floor and have the protagonist lay on it. it's supposed to look a bit hurtful (no blood), but of course the actress should stay unharmed.

Does anyone know what type of glass I can get and where to buy it?

You want sugar glass OP

You can actually make it at home

it's a no budget video..is it expensive to make?

Nah not at all you can find most of the ingredients in your pantry already

Literally just boiling sugar and water, letting it cool on a cookie sheet as soon as it starts to boil, and then breaking the “plane” of sugar glass into shards