Four lockers in the names of his family members have also been sealed.
The banks have been asked to furnish details of the transactions in the sealed accounts and lockers, sources said.
The CBI's anti-corruption branch, which raided the former minister's New Delhi and Mandi residences last Friday, is scrutinising the documents seized during the raids.
Even as suspended DoT official Runu Ghosh continues to be interrogated, there has been no information on Sukh Ram's whereabouts.