New greetings range to include cards, wrap, tags, notepaper and postcards.
Bulldog Licensing is continuing to build up the Sindy programme, adding The Art Group to its roster.
The new deal will see the company create a wide range of branded products including cards, wrap, tags, notepaper and postcards.
The design will focus on Sindy's vintage appeal and the doll's styles over the last 50 years.
Existing Sindy licensees include Poetic Gem (apparel), Helen Rochfort (handbags) and Diablo Skinz (mobile phone, laptop and tablet skins).
Bulldog is also currently targeting sectors which tie in with Sindy's position in the fashion world, such as perfume, accessories, jewellery and footwear.
"We are delighted to have signed this new agreement with The Art Group," said Rob Corney, MD of Bulldog. "It adds to a burgeoning licensing programme for the brand and one that is set to carry on growing, as we are experiencing huge amounts of interest in Sindy from the licensing community."