"All Sierra Leoneans must stay at home for three days," he announced, expanding a previous order for a lock down in the capital Freetown and northern areas of the country nationwide.
"I have made my personal commitment to do whatever it takes to get to zero Ebola infections and I call on every Sierra Leonean in every community to pull together," he added.
People will be ordered to stay home from 0600 GMT March 27 to 1800 GMT March 29, with "no trading activities across the country".
Guinea, Liberia and Sierra Leone which have been the centres of the outbreak which has killed more than 10,000 people have set a goal of cutting off the disease's spread by April 16.
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Liberia had been on the point of declaring an end to the epidemic in the country when a new case appeared in its capital Monrovia yesterday.
The infected woman is the wife of a man already cured of the disease, an anonymous source close the case told AFP.
One of the deadliest viruses known to man, Ebola is spread only through direct contact with the bodily fluids of the recently deceased or an infected person showing symptoms, such as fever or vomiting.
The World Health Organization said Ebola can still be transmitted in sperm 82 days after a patient carrying the virus is cured.
The worst-ever outbreak of the virus has claimed almost 3,700 lives in Sierra Leone, one of three impoverished west African nations that have seen their economies and health care systems wrecked by the crisis.