Hey Ashok,
For giving NEET PG, a candidate is required to fulfill some eligibility criterias, like :

• The candidate must have a valid MBBS degree or provisional pass certificate which is recognized from MCI and must possess permanent or provisional registration certificate of MBBS qualification.
• The candidate should be Indian Nationals & Foreign Nationals citizen.

So you are not eligible for giving NEET PG entrance exam.
And, D.Pharma (Diploma in Pharmacy) is a diploma course after which you cannot think pursue a Postgraduate level entrance exam. After diploma you are only eligible to do a graduation with Pharmacy.
All the Best!

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