Run 2 miles - Yes, this may seem basic on the surface, but it’s different than you think. Have your team or yourself do labs around the track, preferably a quarter mile track. They are to sprint the straight-aways and jog the curves. This is great soccer endurance training for any team, because it helps develop quick sprinting while fatigued.
Cross country run - A general cross country run can do wonders for your conditioning, and is an excellent preseason soccer training program to get people back into shape before hitting the field. Make sure the course has plenty of hills, but not treacherous terrain. You want healthy hearts, not sprained ankles.
Suicides - A classic drill that always seems to whip teams into shape. It not only reinforces sprinting, but quick changes in direction.
Those three drills will address most aspects of soccer conditioning training. Always focus on the goal of training your players for the game, you don’t want them to get hurt before a big match.