bharat,
Masters would not be helpful for a career in SAP SD.
Do not waste money and much more importantly - time.
If you are passionate about SD then go straightaway for training in SD. Go to local institutes that charge less, while choosing an institute see the potential of the instructor (you will take demo sessions before enrolling)
SD market is tough for freshers or people wanting to break into.
More than certification, companies are looking for knowledge, communication and the commitment to add value to the customers' processes.