The offer has not been confirmed by North Korea officials yet, but they have announced that a delegation will be sent to compete at the Winter Olympics - including a "cheering squad" - in what is seen as a major step forwards in improving relations between the two nations.
North Korea has yet to respond to the joint-team proposal.
North Korea has agreed to take part in the games in South Korea, and the two countries have agreed to hold more discussions on easing tensions along their border and reopening a military hotline. In April 2017, South Korea allowed the North Korean team to travel to the South for the Women's World Championships in ice hockey.
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North Korea has offered to send athletes to PyeongChang, and the two sides are working on details of the North's participation, including a possible joint march at the opening ceremony.
The Pyeongchang Olympics, which start on February 9, coincide with high tensions on the Korean Peninsula due to North Korean nuclear tests and contentious exchanges between U.S. President Donald Trump and North Korean leader Kim Jong Un.
The figure skating pair Ryom Tae-ok and Kim Ju-sik were the only North Korean athletes to qualify but missed the deadline to register for their event.