Sanding?
I would only start sanding or bead blasting if the scratches were pretty deep, that is more or less a new finish. Those brushed stainless finishes tend to pick up extremely fine scratches that are not deep but are quite visible due to the shine. If that is the case, first thing I would try is something like Flitz polish or that pink German polish in the yellow tube. Or any paste polish meant for stainless, not just brass or copper polish. Rub it with the direction of the brushed finish. If that does not seem like enough, you could maybe get like a buffing wheel on a dremel tool, or even a larger wheel on something like a grinder motor. I would try the red fine polish first, but there is some more aggressive polishes for stainless steel, mine are whitish colored. Don't try to buff or polish any matte or bead blasted areas, just the shiny brushed area. Still, buff with the direction of the brush marks. Hard buffing with the coarsest polish might be a problem. You don't want to buff it hard and take off metal. Then it will look like an over buffed refinish job. Like on blued guns that they buff to death and reblue but the markings and corners look rounded. Just don't get carried away and you should be alright. Refinishing is a last resort.