I am currently doing a
game programming degree at the
University of Teesside. Part of the degree contains a module called
Tool Programming for Games which is what you would use to create level designers. After all, although game companies have their own level design software, someone has to write it and update it.
If, on the other hand, you are simply wanting to design levels and not get involved in how the software works, then you might want to look at the
Computer Games Design degree. That sounds more like what you are looking for.
A snippet from the Computer Games Design page:
Quote: "
Career opportunities
Graduates of this course have gone on to work as level designers, junior game designers, mission designers and artists and in a wide range of companies including Bizarre Creations, Blitz Games, Volatile, Microsoft Rare, Streamline, Frontier, Rebellion, Eutechnyx, Atomic Planet, Reflections, Venom, Virtual Playground, Midway and many more."
Of course, [url=http://www.multimap.com/maps/?qs=TS1+3BA&countryCode=GB#map=52.37563,0.91861|6|4&bd=useful_information&loc=GB:54.57209:-1.23471:16|TS1%203BA|TS1%203BA]Teesside[/url] is a long way from Toronto but not out of the question. There may be another University close to you that offers similar degrees.
VanB is certainly offering a good suggestion. If you are not ready for University or would like to get a head start, then the U3 editor is a great one to learn because it is the editor of choice on the
Computer Games Design degree at the
University of Teesside.