Upvote:4
Train and bus is an excellent way to get from Stockholm to Hemavan. In Sweden, I recommend using Resrobot, SJ, or Vy for public transport planning. Google Maps sometimes suggests alternatives with transfers that are too short and your connection won't be guaranteed. SJ can sell tickets that include both train and bus travel. If you buy a through-ticket from Stockholm to Hemavan, any connections between trains and buses will be guaranteed.
However, timetables for late June are not yet confirmed and tickets typically do not go on sale until around 90 days prior to departure. You probably won't find any connections if you search now, but try again late March or early April.