No, you have to be properly qualified for being a gynecologist. Although, you can pursue a course for nursing degree or practitioner but not for gynecology.

If you want to be a gynecologist then first you've to apply for NEET and then get admission in MBBS. After completing your MBBS course, Take NEET PG entrance, secure a good rank in entrance as the course you want is highly desirable so, you've to secure a good rank. After giving entrance exam, take admission in the PG Course. After completing your PG you may practice as OBGyn specialist.

So, this is the whole process to pursue the course of Gynecology. You can't directly took admission on the basis of your bsc. Medical course. So, at first you've to give NEET exam.

Hope this helps !

Good luck for your bright future !