... like a huge space whale or anything like that? My Herglic Explorer is traveling through the Galaxy in search of a huge Beast that ate his former ship and crew.

I can make one up, I probably will, but is there precedent in universe, EU or canon?

http://starwars.wikia.com/wiki/Oswaft

Probably wouldn't have eaten a ship, but there's precedent for lifeforms in space that can "make the jump".

Possibly Colossus Wasps.

http://starwars.wikia.com/wiki/Colossus_wasp

Also, the Adasca rigged Exogorths with hyperdrives.

http://starwars.wikia.com/wiki/Exogorth/Legends

The House of Adasca found a way to control the slugs, known to Adascorp scientists as exogorths, after the Great Sith War. Based on the research of Gorman Vandrayk, Adascorp was able to control the hunger drives, growth rate, and reproductive fission processes of the creatures. Arkoh Adasca placed control mechanisms and hyperdrive engines on a group of slugs and sought to sell them to the Republic, the Mandalorians, or the Revanchist faction as superweapons. With the Adascorp modifications, the exogorths could be sent through hyperspace to a specific system. Once there, their increased rate of growth and division could lead to destruction of space stations, asteroids, moons, and possibly even planets. The original exogorths could be sent to another system once they had divided, making it possible to disrupt or destroy hundreds of systems in a very short time. None of the parties who were invited to bid on these new weapons were enthusiastic about using them, however, all three were interested in making sure the weapon did not fall into the other parties' hands.

Awesome! Thank you both.