You can turn a piece of metallic indium into powder by gas atomizing it in a special atomization machine. Indium is melted and the melt is atomized with an inert gas. This is how a lot of metal powders are made, but only specialized companies do such work. It's next to impossible in a lab.
If you have dissolved your indium in nitric acid, you will not get metallic indium powder from it, but indium nitrate powder (salt powder). In theory, it's possible to turn indium nitrate powder back into metallic indium (reduce with the hydrogen or via thermal decomposition of indium oxalate), but you still won't get the powder because indium has a low melting point and forms a melt in high-temperature reduction processes.
If you need just a small amount of powder, you can get machining chips and do some high energy milling.
I did it previously with other materials (M2 and D2 tool steels).
Considering the very low melting point, you may have some issues, but it worth a try.
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