"The decision affects 76 players now on contract," the board's media manager Brian Thomas said, adding the decision had been taken in consultation with selectors and the team management.
The move means explosive opener Tillakaratne Dilshan will not be able to turn out for New South Wales' Twenty20 side in the 2010-11 Big Bash despite having signed a contract with them in March.
The ban, though, is unlikely to affect veteran batsman Sanath Jayasuriya, who is already playing for Worcestershire in the Twenty20 league in England.
Jayasuriya, who is a ruling party lawmaker, was dropped from the recent Asia Cup tournament that Sri Lanka lost to India last week.
Sri Lanka are due to play three Tests at home against India next month followed by a triangular series with New Zealand as the third team.
Sri Lanka, which is co-hosting the tournament with India and Bangladesh, is hoping to capitalise on home advantage to win its second world title since lifting the Cup in Pakistan in 1996.
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