There are various facilities that provide indoor soccer training for players during the off-season months. This is not an endorsement but rather for informational purposes only.
Five Star Academy, Oxford, MA http://fivestaracademy.com/
Teamworks, Northborough, MA https://www.teamworksnorthboro.com/default.aspx
ForeKicks, Marlborough http://www.forekicks.com/marlboro/index.cfm