I don't think anyone here is going to be able to tell you unless they have recently imported a similar car in similar circumstances, and you haven't told us any of that.
Are you asking merely about the cost of the actual transportation, or about duty, taxes, and what it will cost to get the car to meet Canadian standards, if that should be necessary?
For instance, is this a car you currently own in Japan, and you are moving it to Canada along with other possessions? Or do you want to go to Japan, buy a car, and bring it back to Canada? Or have someone else do it on your behalf? How old is the car? What is it worth? Will it come by ship or by plane? All that stuff can affect the cost.
If I wanted to know, I'd contact a company that transports cars internationally and ask them.