Is it possible to apply graduate program in a different major? I'm a business student and I'm really fond of computer science and engineering. Is it possible to apply for cs major in computer science? If not, is it possible to apply for MaSc in Master of Business Analytic then continue to study in CS?
Your specific degree doesn't matter as much as your other experience. If you are a business student, but have focused on coursework in CS/engineering, done undergraduate research in a CS/engineering lab, etc, you have a better shot.

I am assuming you are roughly a senior undergraduate student based on your question, but I would also advise that if you are truly finding yourself more interested in CS/engineering it might be to your benefit to take an additional undergraduate year and get some of the required courses under your belt for the graduate programs you will be interested the following year. Graduate program staff at your current institution are probably a good resource for what types of courses would benefit you.