Yes, there are some restrictions on the amount of money you can transfer in a single transaction.

The overall transfer limit for UPI transfers is 1L per day, but there may be additional restrictions per transaction on a bank-to-bank basis.

For example, the BOI allows 1 lakh per day but only 10,000 per transaction.
The bank determines the maximum amount per transaction for IMPS/NEFT/RTGS transfers. For IMPS, the standard limit is Rs.2 lakh per transaction, however, you should check with your bank to ensure the precise amount.

The maximum amount per transaction for trading portals gateway transfers is $1 billion. If you wish to transfer more than $1 million, you'll have to make repeated transfers.