The changes come as the board prepares to hold a fresh election to end a long-running power struggle for the top job.
"The amended constitution is approved by the Supreme Court and is a truly democratic document and will guarantee an end to the uncertainty in the PCB," acting chairman Najam Sethi said Tuesday.
The post of PCB chairman has changed five times since May over an electoral dispute.
According to the new constitution, the holder of the post -- which was previously filled by the government of the day -- will now be elected from a ten-member Board of Governors.
Observers say the move will weaken the influence of the national prime minister because he will only nominate two of the board's 10 members.
Sethi has announced he would not contest the election but would remain part of the board.
Pakistan cricket board to approve new constitution - Cricbuzz