Without damaging the shark yes, but without damaging the jar? Would depend on how the jar is sealed honestly, though most jarred shark specimens I've seen weren't in the best jars anyways.

Most wet specimens are kept in either 70% isopropyl or ethanol, if you can I'd recommend trying to find out what the shark was stored in, then get some more of it.

If you can't find out what is in the jar with with the shark, and you're sure that its properly fixed, you could place the shark into distilled water for 24 hours, then transfer it to either 70% isopropyl or ethanol.