Dear Satish,
For becoming Information Systems auditor, ICAI is providing certification; but I believe it is for qualified CAs;better than that ISACA an international organisation is providing CISA certification; to get cisa certificaton, you have the following requirement:-
a.clear the CISA examination conducted by ISACA
b.Should have 5 years Information Systems Audit experience.
Then you wil be awarded the CISA certififation which has international repuation and also has good remuneration will be paid by clients/consultancy firms
c.waiver 5 years experience can be available if-you have 1 year audit experience in-financial audit/process audit/operations audit.Your degree qualification will give waiver for 2 years;
If you require furthe details, please visit www.isaca.org
For people who have passion in IS audit, this certification is a very good one.
regards,
ts rao