Graham Ford is set to begin a second stint as Sri Lanka's head coach, with Surrey - his present employer - confirming the news on Thursday.
Surrey have announced Graham Ford is leaving the club to coach Sri Lanka for a second time.
Ford was previously at the helm of the Asian nation between January 2012 and January 2014, before taking charge of English county Surrey.
Sri Lanka have since been coached by Paul Farbrace, Marvan Atapattu and Jerome Jayaratne, the latter appointed on an interim basis in September.
But Ford is now set to return to Sri Lanka, with Surrey confirming his departure on Thursday.
A statement read: "Surrey County Cricket Club can confirm that Graham Ford is leaving the club to take up the post of Sri Lanka head coach."
Surrey director of cricket Alec Stewart added: "We are extremely disappointed to be losing Graham Ford, who has not just been an outstanding head coach, but has played an integral role in the progress that we have achieved over the last two years.
"He has worked tirelessly with the players and his efforts can be seen in their individual performances and the team's results, culminating in promotion back to the first division [of the County Championship].
"It was a very tough decision for Graham to leave Surrey but we understand that the opportunity to go back and coach at international level with Sri Lanka was too good to turn down.
"Despite the timing of his decision, we wish Graham all the best and we will immediately start our search for a new head coach."