After briefly playing for Otago United in the New Zealand Football Championship, Boyens was drafted in the first round of the 2007 MLS SuperDraft by Toronto FC.

After an up and down season Boyens' solid play in central defence helped Red Bulls pull off a surprising first-round upset in the MLS playoffs, defeating defending champion Houston Dynamo 4–1 on aggregate.

After appearing in 41 official matches for the club in three years, New York Red Bulls announced that Boyens would not be part of their plans for the 2011 MLS season.

He made his national team debut in an unofficial friendly later that year, when he came on as a substitute during New Zealand's 5–1 loss to Spanish club Sevilla FC on 15 August.

[2] The Observer noted that the defensive back two pairing of Boyens and Ben Sigmund were "boasting 10 minutes international experience between them".