Not a Sublime developer/sales guy, but http://www.sublimetext.com/buy
says the following:
Licenses are per-user, rather than per-machine, so you can enjoy Sublime Text on as many computers and operating systems as you wish with your license.
The way I interpret it, if you buy a license, you can use it both on your work computer and your home computer, if you are the only one using it.
If other people use Sublime on your work computer while you are at home, it might not fit the definition and it would be a nice thing to buy two licenses.