Hi Gopi,
Good Decision you take. to be frank why you want shift "SAP"? .You cannot think yourself from a fresher to an experience SAP Consultant in overnight. It needs lot of commitment, dedication, sacrifice, effort, expertise and ability to become a reliable SAP Consultant. Unfortunately, there is no short cut to achieve this.
Anyway your decision is very good.you have good business process knowledge(domain experience) you can learn and pickup easily.
Once you enter SAP Think always SAP is your passion or your life . walk behind your passion. it will take you right path.
As per your domain experience, Find out good training center. start to learn SAP PM or MM but one thing you want remember " HARD WORK NEVER FAIL"
Edward