You need to have two qualities over and above your qualifications and experience to get employed in Qatar.
First comes nationality and in your case as you are an Indian, the state or province you come from holds much importance. This is because Keralites at HR positions in companies here will hire only people from Kerala. That also applies to people from Hyderabad. So if you are from any of these two places, try to get into touch with people from this area and they will help you out.
The second thing that is of importance, is the right religion. There are companies here where the "right religion" is an important criteria for selection. I have personally faced such situations not just in Qatar but also in S Arabia where they have set up a mafia to prevent Muslims from getting employed. One simple way is by restricting a job vacancy only to Filipinos where one does not need to mention any religion as most Filipinos are Christians.