Unfortunately no, I never managed to include it as a module. What I did was use the typings of snagsvg directly in the ng2 controller, and added the reference to the snapsvg js file in index.html. This bypasses the whole angular dependency injection framework and the SnapSVG JS file is downloaded as soon as the page is loaded (leading to longer load times) -- but since I'm working on a Single Page Application, I can tolerate it being loaded immediately.
I'm sure there's a way to wrap the snapsvg into an Angular module, but I'm new to NG2 (and Angular in general), so I need more time to learn how.