"We received an e-mail from the Zimbabwe Cricket Union (ZCU) seeking a postponement of the tour and the reason given was 'due to unavoidable circumstances'," SLC secretary Nishantha Ranatunga told reporters.
"No further reasons were given by the Zimbabwe Cricket Union and we are awaiting further clarification on this matter."
Unconfirmed reports stated that the ZCU, which hosted India in July and are currently playing Pakistan at home, do not have the budget to host a third country in the space of four months.
Sri Lanka were due to tour Zimbabwe from October 6-November 4 to play two tests, three one-day internationals and two Twenty20 matches.
(Editing by John O'Brien/Sudipto Ganguly)
