Vigineswari Pasupathy, 24, was given 24 months' probation, ordered to serve 150 hours of community service, and put up a SGD 5,000 bond.
Her elder sister, Rajeswari Pasupathy, 26, was jailed for 15 months for masterminding the housebreaking and stealing SGD 20,000 worth of jewellery with stolen keys from a boy student.
The two had represented Singapore in cricket and were working as part-time assistant cricket coaches in a premier school in Singapore.
In May 2012, they found out that one of the students' parents were away, and that the 12-year-old boy was alone at home, according to a report by Channel News Asia.
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In sentencing, District Judge Mathew Joseph said the siblings committed the offences "with careful pre-meditation and perverse planning".
He added that he found the abuse of their positions as coaches and teachers to be "greatly disturbing".
The sisters could each have been jailed up to 10 years on each count of housebreaking.
Jeraj was punished with a 15-month jail sentence in May this year.