The Caribbean side booked its spot by virtue of its current seventh place in the ICC T20 rankings at the end of 2018, with the top eight teams, including hosts Australia, securing places at the showpiece event.
Minnows Afghanistan, coached by Trinidadian and former West Indies head coach Phil Simmons, also qualified directly by virtue of its eighth place in the rankings.
Former champion and three-time finalists Sri Lanka, ranked ninth, and Bangladesh, 10th, will have to go through the group stage of the tournament with six other qualifiers to make the Super 12.
Six teams from the ICC T20 World Cup Qualifier later this year will join Sri Lanka and Bangladesh in the group stage, with four qualifying to the Super 12 stage.
West Indies won the T20 World Cup for the second time in 2016.Since then, the team’s form has been erratic.