Um... not a good idea. First off, your snake probably wouldn't appreciate the water hitting him/her and would most likely spend the entire time trying to get away. Also, the typical shower temperature for you is MUCH warmer than what your snake would feel comfortable in. The water temps should be around 90 which would seem lukewarm to you in the shower.

Also, many snakes defecate while soaking. Probably not something you would want to deal with while in the shower.