yes, you can.
You need to make sure you have something for a backing though so you don't put finger marks in the paint. A sanding block works or a small piece of cardboard folded over a few times.
Make sure you wipe the area dry every few passes so you can stop when the scratch is out.
The problem with colorsanding is it can easily take off more than the .3 mils of clear that contain the UV blockers so many people don't colorsand and just leave the scratch in there.