Yes, you can convert your SBI max gain home loan to regular home loan. To do this, you may have to contact the loan manager of the bank and ask details about the conversion. You will be asked to submit your loan account statement from day one and list of documents that were submitted while availing the SBI max gain home loan. 

You may be charged a fee by the bank for the conversion. To get more details about switching your plan, it is best to contact the bank for further clarification.