Yes and no.
If you simply want to transfer a banked week to another account, it's not possible. Instead, work with the other person so that the intended user gets what he/she wants.
However, if someone is selling a timeshare and wants to transfer a banked week at the resort, there are two possibilities.
If the timeshare being sold is the only one associated with the seller's II account, the seller can transfer the entire account, which includes the deposited week, to the buyer. II requires that an additional year's II membership be paid at the time of the transfer.
If that's not workable, the seller can transfer the rights to the deposited week to the buyer. The rights to the deposited week will be canceled and the buyer will get an accommodation certificate which expires on the same date as the deposited week would have. No extensions are permitted. There is no guarantee that the trading power of the certificate will be as good as the deposited week. Again in this case, II requires payment for an additional year of II membership.