The short answer is you can't shoot them unless you are the landowner or an authorized agent acting on his behalf. Hunting and protection of property are two entirely different things and your small game licence isn't much help.
Here is an excerpt from the regulations:
Protection of Property
Generally, you may on your own land, capture, kill or harass
nuisance wildlife to stop that nuisance wildlife from damaging
your property. This does not apply to moose, caribou, elk
or endangered species. White-tailed deer may be killed or
harassed with an authorization from the ministry. You may
also use an agent if the agent is authorized by the ministry or
belongs to a class of agents prescribed by the Regulations.