How would such sanctions evasion operations through India be accomplished ? if I was sitting in a regulatory agency in India, i would look for;
(1) Use of Hawallah resources, as they lie totally outside the global financial system.
(2) Routing the goods through the UAE, as trade with India is not going to set off alarms in Dubai.
(3) Using third-party countries that trade with Iran, such as China. Individuals involved in this activity might even want to work through Myanmar or North Korea (DPRK).
Of course, I am assuming that Indian regulators and law enforcement agencies are interested in enforcing UN/US/EU sanctions on Iran. Are they really, I wonder ? Does anyone know ?