If you are already PMP certified then pursuing Project Management course of IIM Kozhikode will not add much value to your experience. This is because
Firstly the course is for professionals who are interested in acquiring the PMP and CAPM certification. Since you are a PMP certified professional, it means that you are an experienced professional too. So this course will add no value.
Secondly, the objective of the course is to impart real-time work experience, and understand the principles of project management. As a PMP you already have these skills.
If you want IIMs title for your CV then go for it. But know that you won’t learn anything new from it.
Both the certification courses PMP and SSGB fall under the Operations domain yet are very different in reality.
PMP: This course facilitates handling and delivering projects efficiently and quickly. If you are interested in Project Management, the best option is the Project Management Professional (PMP) certification which is affiliated with Project Management Institute, PMI, USA. It
also provides PDUs.
SSBM: This course facilitates proper optimization of business processes, minimizing waste and time wastage. If you are interested in the Six Sigma Green Belt (SSGB), then Indian Statistical Institute (ISI) Kolkata is the best option available. Some even think ISI Pune is good yet I will recommend you to go for Kolkata itself.