How does one learn research methodology?
There is a strong need for learning research methodologies, and many postgraduate research courses require as prerequisite research methodology evidence.

The good news is that many institutions do offer specific courses in research methods; the better news is that many offer distance learning and there even some MOOC/Open learning options available. Below are some examples that I'm aware of (I'm sure there are many others):


Open Learning Initiative (Open)
City University London
University of Birmingham
University of Southampton
Saylor Academy (Open)
ACS


There are also a squillion books on research methods