In a mixing bowl, combine jelly powder, coffee powder, and sugar. Mix well.
Add water then stir well.
Transfer to a pot. Cover then turn on the heat (medium fire). Bring to a boil.
Transfer to a glass or heat resistant container. Allow the jelly to set for 45 minutes. You can also chill it to set faster.
Slice the jelly into cubes then set aside.
In a mixing bowl, combine evaporated milk, condensed milk, and all-purpose cream. Mix well.
Combine the jelly cubes, the milk mixture, and the cooked sago. Mix well. Cover and chill for at least 1 hour.
Transfer to serving cups. Enjoy your coffee jelly sago!