even if it's not
I have a cunning plan that cannot fail.
A player cannot be sent from the "Brig" to "Sickbay". The same is true for cards such as "Witch Hunt" where a player has to be chosen to be sent to "Sickbay".
For reference, this is a ruling in the official FAQ (p. 2, "The Brig and Sickbay")
It's also worth looking through the Unofficial FAQ, which collects a number of rulings made in response to various questions that have come up on BBG.