The launch will be backed by a "multimillion-pound" campaign across all disciplines and will be unveiled later this summer.
Finex, already on the Sky roster, has been appointed to work on direct marketing and Venture 3 will develop the branding side.
Earlier this week, the agency was appointed to handle a hard-hitting government anti-binge drinking campaign, after a three-way pitch with Mother and RKCR/Y&R.
Sky announced its decision to launch into the broadband market earlier this year, following the acquisition of ISP Easynet for £21m.
Easynet was the first telecoms company to unbundle BT exchanges, enabling it to use its own equipment rather than BT's to provide broadband.
The service is currently available in 30% of UK homes, but Sky hopes this will rise to between 50%-70% by the end of the year.
Sky currently has 8m customers and has perviously said that many of them are "demonstrating an appetite for taking additional services."
BSkyB is also predicted to bid for Time Warner's AOL UK internet business, along with BT and Carphone Warehouse.
AOL UK was put up for sale at the end of May after Time Warner appointed Citigroup to evaluate the company's strategic options.
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