it is specified service section 9 (3) under reverse charge mechanism in the GST Law. in the case you have to pay GST Tax under RCM if who wants to do with sponsorship.
Note- The government of India is made two section for RCM .
1.Some specified services are coming under section 9(3) of RCM . thats GTA, Legal service like advocate fees,Director service other than salary ,sponsorship etc.
2. other than specified service are coming under section 9(4) of RCM .in this connection, who has GSTIN registered if they will do the business with unregistered dealers then register dealer wants to pay tax under RCM.