Yes there is a sequel of Gone with Wind. The sequel is actually a mini-serial produced for tV in 1994 and based in the sequel of the original novel by Alexandra Ripley.
The mini-series features actors Joanna Whalley as Scarlett O'Hara and Timothy Dalton as Rhett Butler and received mixed reviews.
The original film is one of the greatest of all time and was directed by Victor Fleming in 1939 and featuring Vivien Leigh and Clarck Gable as main characters.
The film was based in Margaret Mitchell's novel of the same name which won the Pulitzer Prize in 1936.