Instead of topup on homeloan, is it possible to transfer to another bank with higher loan amount

Instead of topup on homeloan, is it possible to transfer to another bank with higher loan amount. For example:- Say i have a home of 1 cr value on registration document and home loan of 30L with Bank A. And i need 20L as topup but Bank A is qouting very high interest rates. Is it possible to transfer the balance and also get extra amount of 20L as a single home Loan (total 50L) from a different bank say Bank B?