The ex-Gloucester head coach will take on the role as interim forwards coach, assisting interim head coach Scott Johnson.
SRU chief executive Mark Dodson said: "Dean will be with us for 12 weeks and will bring all his top-flight coaching savvy and experience to benefit our forward pack."
Ryan, who won four caps for England during a playing career which saw him represent Saracens, Wasps, Newcastle and Bristol, said: "I've responded to an invitation from Scott to assist the Scotland management team over the next 12 weeks and will look to bring my experience to bear to give Scotland players the best opportunity to represent their country in the best way."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.