CCSA spokesman Taweesilp Visanuyothin said the decree will be extended to the end of May.
The reason is concern about the return of the virus, with the centre still battling to stop it spreading any further.
The decision means the night curfew from 10pm-4am will continue, no social gatherings allowed and only limited inter-provincial travel, among other restrictions, Dr Taweesilp said.
The meeting was chaired by Prime Minister Prayut Chan-o-cha and brought together all agencies to discuss the impact of the decree.
The National Security Council told the meeting that it surveyed public opinion, and it favoured the extension of the decree, Dr Taweelsilp said. He gave no other details of the survey.