The charity is a partner of Sainsbury's Active Kids voucher scheme, whereby shoppers redeem coupons for sports equipment for their local school.
It has created the role to boost its profile and increase brand awareness to attract more sponsors. Quantrill joins from The Headland Consultancy, where she was a freelance consultant.
The charity, which aims to encourage involvement in sport and exercise among under-18s, will emphasise that sport has academic and social benefits, as well as health implications.
'We want to take the Youth Sport Trust name forward and focus more on our publicity than we have done in the past,' said Quantrill.
She added that the drive meant there was a possibility of new roles being created within her department.
Quantrill oversees a team of six and has responsibility for marketing and events as well as PR, reporting to chief executive Steve Granger.
She said she plans to increase the charity's presence in the regional press in a bid to drum up local support and involvement.
'Local community media are an important vehicle for us to get our message across,' she said. Businesses, politicians, schools, children and parents will be targeted.
Quantrill was formerly a press officer for pensions minister Ian McCartney.