The ICC's ruling comes following a standoff between Chandimal's Sri Lankan side and the officials on day three of the Test.
Chandimal is accused of breaching Level 2.2.9 of the ICC Code of Conduct for "changing the condition of the ball".
Their players protested the charge and the subsequent penalty of a ball change and the award of five extra runs to the opposition by refusing to take the field at the start of the third day's play.
The Sri Lankans were told on Saturday that play could not continue with the existing ball.
Action finally got under way half-hour before the scheduled lunch interval after Sri Lanka Cricket authorities instructed the team to take the field but "under protest".
"The team management has informed us that Sri Lankan players have not engaged in any wrongdoing".
The ruling on Chandimal comes at an inopportune time for the Sri Lankan skipper who was his team's only shining light in the first innings following a sparkling unbeaten 119 in the first innings.
Earlier in the day, Chandimal was charged by the global cricket body in the aftermath of the high-voltage drama that took place during the third day of the Test.
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The West Indies were awarded five penalty runs and Sri Lanka eventually agreed to take to the pitch with the ball being changed. So maybe Gould was just being over-cautious.
The umpires took the call to change the ball on Saturday morning and that angered the Sri Lankan team.
Opening batsman Cameron Bancroft, the player caught on camera applying sandpaper to the ball, was banned for nine months.
Following the Bancroft incident, which resulted in three Australian players being handed lengthy bans by their own board, the ICC chose to consider severe sanctions against ball tampering.
Devon Smith had earlier struck 61 while Dowrich extended his good form in the series with a sixth Test half-century of 55 as West Indies tried to rally from their overnight 118 for two, following Friday's rain-hit second day.
That match was the only Test in the game's history to be forfeited after Pakistan refused to return to the field.
On the field, Sri Lanka clawed their way back into the match to restrict West Indies' lead to 47 after the hosts resumed on 123 for two replying to 253.
West Indies, however, lost their last six wickets for 59 with the dismissal of Roston Chase for 41 triggering a decline from 241 for four.