The 41-year-old is without a race seat for the coming season following HRT's departure from the sport.
The Spaniard told reporters: "It is amazingly motivating to be working for a team like Ferrari, not just because of what it represents in the history of Formula 1 and motoring in general, but also because it will be a completely new and very stimulating experience for me.
"I really hope I can get to work as soon as possible and to help in the development of the car. I am happy to be collaborating with Fernando [Alonso] again and also to be working with Felipe [Massa].
"There's not much time until Australia, but there is a lot to do and I am available to help the team from right now."
De la Rosa will mainly undertake simulator work with the team, having spent many years carrying out a similar role for McLaren.
Ferrari are due to unveil their 2013 car on February 1.