Army commander Gen Prayuth Chan-ocha has already said it could take more than a year for new elections to be held because peace and reforms must be achieved first.
Today, he said that a temporary constitution would be drafted and an interim government installed in the next three months.
"A government will likely be set up in August or early September," Prayuth told a meeting of civil servants. "When we have a government, we will move forward. Then the reform council can begin."
The army seized power May 22 in a bloodless coup, overthrowing a government elected by a majority of voters three years ago.
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Prayuth has justified the coup as a necessary action to restore order after half a year of anti-government protests and political turmoil that left at least 28 people dead and the government paralysed.
But since taking power, the army appears to be carrying on the fight of the anti-government protesters by mapping out a similar agenda to redraft the constitution and institute political reforms before elections.
Yesterday, a military court extended the detention of prominent activist Sombat Boonngam-anong for an additional 12 days.
He has been held without charges since his arrest June 5, but has been informed that under martial law he faces up to 14 years in prison on possible charges of inciting unrest, violating cyber laws and defying the junta's orders.
Sombat had spearheaded an online campaign calling for people to raise a three-finger salute borrowed from "The Hunger Games" to show opposition to the coup.