"We will be working with others on a resolution on further sanctions," Ambassador Matthew Rycroft told reporters.
The United States, Japan and other members of the 15-member council were working on a draft text that would strongly condemn what Pyongyang has called a hydrogen bomb test, diplomats said.
"We have no information on the type of device tested," said Rycroft, but he added: "Any nuclear test is a clear violation of UN Security Council resolutions."
North Korea said it had carried out a "successful" miniaturized hydrogen bomb test -- a shock announcement that, if confirmed, would massively raise the stakes in the hermit state's bid to strengthen its nuclear arsenal.
The council was set to hold a closed-door meeting from 2130 IST to discuss the nuclear test, at the request of the United States and Japan.
A senior UN diplomat said there would be a strong statement of condemnation from the council and work would begin on a draft resolution that would provide for targeted sanctions.
It was unclear when a vote on the draft resolution would take place.
Three previous tests in 2006, 2009 and 2013 triggered waves of UN sanctions.
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