How to enforce the sanctions has also been an issue between the US and China, the North's last-remaining major ally.
Beijing voted for the UN resolution and says it will meet its obligations, but is concerned that excessive measures could worsen the situation.
The North's nuclear test continues to have repercussions across the border, where the head of South Korea's main intelligence agency has offered to resign, making him the third minister-level official to offer to submit his resignation since the North's test.
On Tuesday, Unification Minister Lee Jong-seok, in charge of reconciliation with North Korea, also offered his resignation, saying he wanted to take responsibility for the North's nuclear test because he was the main minister in charge of North Korean affairs. The country's defense minister offered to quit on Monday.
Roh plans to accept all those resignations, Yonhap news agency said.