In an attempt to subdue opposition to the coup, the military has been running a charm offensive alongside its repression.
The BBC's Jonathan Head in Bangkok says ensuring the World Cup can be watched by everyone is central to this so-called happiness campaign.
The RS broadcaster had already bought the rights to the matches and planned to allow only a third to be shown on free-to-air channels.
To see all of them viewers would have to buy a decoder, at a cost beyond many poorer Thais.
So the military has ordered the national broadcasting regulator to negotiate a deal for all the matches to be shown at no cost, despite the potentially hefty compensation claims.
Our correspondent says the military seems willing to spend generously to win hearts and minds.
It is already promising to subsidise farmers, to revive ambitious infrastructure spending plans and to cap the costs of basic foods.
The initiatives are borrowed from the government that the junta overthrew after months protests often directed at those same policies.
From http://m.bbc.com/news/world-asia-27790396#
Composed on a mobile phone.