Lightning and heavy rain caused the game, the fourth in a triangular series also featuring West Indies, to be abandoned after 13 overs.
Zimbabwe salvage tie in thriller with West Indies
The incident occurred during the second over of the match when Chibhabha stayed in his crease after playing a shot and was not attempting a run.
"The throw missed the batsman and went to the wicketkeeper, but such a reaction from the bowler was deemed as contrary to the spirit of the game," the International Cricket Council said in a statement on Tuesday.
Two demerit points have also been added to Lakmal's disciplinary record, the governing body added.
Zimbabwe, Sri Lanka ODI washed out
If a player accumulates four to seven demerit points within a two-year period they are converted into two suspension points, which brings a ban for one test or two ODIs or T20Is, whatever comes first.
No hearing was required after Lakmal admitted his offence and accepted the penalties.
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