"The reforms are tough but they're unavoidable to save the economic situation," Sisi said in an interview published on Saturday by state newspapers.
In exchange for the IMF loan, Egypt is expected to adopt drastic reforms to increase public revenues and reduce state subsidies, which make up 7.9 percent of government spending.
Sisi described a "programme for real reforms that aims to provide subsidies to those who deserve them and no one else", promising "protection for those with low incomes".
"The army is playing an important role in development but this role will diminish in the coming years when it will have finished its plan for the reconstruction of state infrastructures," he said.
For decades, the military -- which produced all but one president since 1952 -- has played a key economic role, producing everything from washing machines to pasta, alongside building roads and operating gas stations.
"We have gas fields more than 200 kilometres (125 miles) off our shores such as the Zohr field and others. We need to be able to secure and protect them," he said.
Italian energy giant Eni in August announced the discovery of Zohr, the "largest ever" offshore natural gas field in the Mediterranean with a potential 30 trillion cubic feet (850 billion cubic metres) of gas in about 100 square kilometres (40 square miles).
"The cost of a Mistral is equivalent to one month's revenues from the Zohr gas field," Sisi said.
Egypt's parliament in August passed a law on value added tax, one of the reforms promised in exchange for the IMF loan, to be set at 13 percent for 2016-17 and 14 percent for the following fiscal year.
The VAT replaces a sales tax of 10 percent, although the government says about 50 services and products will be exempt, including bread.