let me explain you how it works
Assuming your interest is to settle in canada by getting a PR, first you need to enter into canada.
1. If you are a graduate of masters degree, either apply for PhD or masters again (it becomes double masters, you need to convince with strong SOP), you can try PhD in Organizational development, PhD in Employee relations, PhD Organizational Psychology.
2. To take a postgraduate diploma/certificate program (which is lower than a masters and higher than bachelors), better go with your undergraduation degree. You can try PGD in statistics, PGD in data analytics
So for your scenario, I suggest you to apply again through your undergraduation, by getting admitted into PGD related to your UG. this will benefit you with higher chances of visa getting approved, later once you land you can move to HR.
But, if you are sure to move ahead only with your MBA and PGD in HR, its fine but have a strong SOP, may be you can state like the MBA you have done is a general management without specialization, and now you need to specialize in one year program. Give a strong reason to them. This might help, just try your luck.
HR job scope seems good than project management in canada.