A female teacher from a private boys school on Sydney's Northern Beaches is behind bars on remand after being accused of sexually abusing a student.

Police will allege Ella Clements, 24, engaged in an "inappropriate relationship" with a 15-year-old boy in her care at St Augustine's College in Brookvale.

Sexual assault support services:

NSW Health Sexual Assault Services

NSW Sexual Violence Helpline on 1800 424 017

NSW Victims Services on 1800 633 063

1800RESPECT national helpline on 1800 737 732

Sexual Abuse and Redress Support Service on 1800 211 028

Bravehearts (support for child sexual abuse survivors) on 1800 272 831

Child Protection Helpline on 132 111

MARS Australia (for men affected by rape and sexual abuse) on (07) 3857 1222

VIC Sexual Assault Crisis Line on 1800

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