Tā yì dì qiú xué, měi nián zhǐ néng huí jiā yī cì.
He studies away from home and can only return once a year.
Tips
usage
异地 is very commonly used in 异地恋 (yìdì liàn), meaning a long-distance romantic relationship. 异地办理 means to handle administrative matters in a different location (e.g., renewing your ID in a city that is not your hometown).
