At Sport Resource Group we are all about safety and fun! We came across this nice write-up on indoor soccer from over that CoachUp. Indoor Soccer games are generally fast paced and aggressive. There are many differences between an outdoor soccer game and an indoor Soccer Game. Indoor games generally have fewer people playing on each team, with the sizes ranging from five per side to seven per side. A regular soccer game in an open field has eleven players per team. Having played in an indoor soccer league for four years, I realized that there are many precautions that soccer players need to take for this type of game.