From the link: http://www.wisegeek.com/what-is-a-sales-consultant.htm
A sales consultant is a person who provides analysis and training to help a business improve its sales.
Some people also use this term interchangeably with that of sales associate or salesperson, a person who sells things to other people. The training and responsibilities of a sales consultant depends on the type of consultant: one who advises businesses and other salespeople often has years of experience and training, while one who sells products may not need much training at all to start with. The work environment for both of these careers is generally fast-paced and involves a lot of interaction with people.