Wrestling is currently not included as a varsity or intramural sport. To my knowledge, there is no wrestling club either.
While at RMC, you will be expected to compete in intramural sports or play on a varsity team. If you find the spare time in your first year (which I find unlikely, but you never know...) to wrestle on your own time either with a local club or an open program at Queen's, then you will do so precisely then: on your own time, so not on Tuesday or Thursday evenings when you do IMs, or the other evenings when you could have different kinds of obligations.
You could look into receiving individual varsity status. High-level athletes (ie. national-level competitors) can apply for funding and status as varsity athletes if it is reasonable in terms of cost, and coaching/training can be found, etc. You would have to look into the individual varsity status program at the College.
Unless you are a very high level athlete, that is unlikely. Alternatively, you could join on of the clubs that is similar. Judo is certainly far different from wrestling, but I know for sure that RMC has a Judo club, if you have any interest in that.
Good luck.