Sisi is a former army chief who overthrew his Islamist predecessor in 2013 and won an election a year later.
Some of his supporters including a member of parliament want to allow Sisi to stay longer in office by extending the time between elections and removing the two four-year-term limit.
But Sisi said elections will take place as scheduled in March or April 2018 and he would not ask for a constitutional amendment.
"I'm with preserving two four year terms and not to change it," he told the American broadcaster.
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"I'm not for any amendments to be made to the constitution in this period," he added.
Sisi won the 2014 election with about 97 percent of the vote. His only opponent, Hamdeen Sabahi, received less votes than spoiled ballots.
The president is popular among many Egyptians who say the country needs a firm hand following years up tumult that battered the economy.
So far only one opponent, lawyer and dissident Khaled Ali, has announced his candidacy for the 2018 election.
Ali, who challenged an unpopular government deal to hand over two Red Sea islands to Saudi Arabia, had run in the 2012 election that brought Islamist president Mohamed Morsi to power.
He received less than one percent of the vote then.