「罰金を科せられる」は英語では「to be fined」に相当します。上記に書いた通り「罰金」は「fine」になります。
「高額」は英語に訳すとこのようになります。
a large sum/amount
a large sum/amount
an exorbitant sum/amount
an expensive sum/amount
「プロのサッカー選手が練習に遅刻すれば、罰金を科せられるらしいよ。」は英語で:
Professional soccer players get fined an exorbitant amount if they are late to practice.
Professional soccer players are fined a large sum if they are late to practice.
Apparently, professional soccer players are fined an expensive amount if they are not at practice on time.