Bones-coa.
Tools like that exist, atleast over here. Let me try to describe the few I know off.
1.) Sanding blocks, those are like rectangular stones and come in different grids.
2.) Plastic sticks where the sandpaper wraps over one end, if paper is finished peel off and apply a new one.
3.) Sand paper handles, 3 to a set in different size and angles the handles got a jelly like substance attached that is sticky. Apply paper cut to size, when finished rip off, moisten gel and add new paper.
4.) Home made sanding sticks, I use different things from wood dowels to plastic rods, apply sandpaper with white glue, when finished rip off wash glue off and redo. Whatever fits in size and diameter will get sandpaper stuck to it.
No. 4 is a good method for hard to reach spaces or where you need an exact fit of the sanding material.
In addition to that I use fabric backed sandpaper or 3m sanding foam blocks.
Hope this helps.