Sanding is the process of removing a surface layer of wood with abrasive materials.
Sanding paint is a technique also called distressing. It consists of roughening surfaces and sand away the edges of a wood panel or furniture, to give it a weathered/aged look.
How to distress sanding paint (DIY/comedy video)
How to distress (advanced how-to)
Health and safety when sanding paint (Greenopedia)
Examples on Superuse.org
Examples on Harvestmap.org