Competition boss Rod Sims says the federal government must rip up the rules that give the national broadband network monopoly protection before splitting up its divisions and selling them off.

Mr Sims is set to make the recommendations during a wide-ranging speech to the NBN Rebooted event in Sydney on Monday.

ACCC chairman Rod Sims is seeking another five-year term as the competition regulator. Credit:Nic Walker

NBN Co's business case is propped up by legislation that stops rival telcos connecting users to new high-speed broadband networks. This boosts NBN Co's profitability so it can stay off the budget, while helping pay for services in the bush.

But Australian Competition and Consumer Commission chairman Mr Sims will become the latest in a series of leading competition experts, including his predecessors Graeme Samuel and Allan Fels, to call for NBN Co's monopoly powers to be clipped so its rivals can compete.