Rodman said the purpose of his visit was to display his friendship for Kim and North Korea and to "show people around the world that we as Americans can actually get along with North Korea."
Speaking to reporters in Beijing ahead of his flight to Pyongyang — his second trip to the North — Rodman declined to say whether he would seek Bae's release. Bae's health is poor, and he was recently transferred to a hospital.
"I just want to meet my friend Kim, the marshal, and start a basketball league over there or something like that," said Rodman, wearing rings through his lower lip and each nostril. "I have not been promised anything. I am just going there as a friendly gesture."
Bae was arrested in November and sentenced to 15 years of hard labor for what Pyongyang described as hostile acts against the state. Rodman once asked on his Twitter account for Kim to "do me a solid" and release Bae. Kim has the power to grant special pardons under the North's constitution.
"I'm not there to be a diplomat. I'm there to go there and just have a good time, sit with (Kim) and his family, and that's pretty much it," Rodman said, adding that he planned to see Kim "pretty soon," perhaps later Tuesday or Wednesday. Rodman is being hosted in North Korea by the Ministry of Physical Culture and Sport, which has not confirmed if or when Rodman will meet Kim Jong Un.
Meetings between senior North Korean officials and foreigners are normally not officially confirmed or announced in advance.
Rodman first met Kim — a die-hard basketball fan — during a visit in February to promote the sport and make a film. U.S. officials frowned on the trip for giving the young leader a propaganda boost.
In the weeks that followed, after U.N. sanctions imposed in early March over Pyongyang's February nuclear test, North Korea threatened Washington and Seoul with nuclear and missile strikes and shut down an inter-Korean factory in the North.
Rodman, however, suggested "basketball diplomacy" could warm relations and said that Kim wanted President Barack Obama to pick up the phone and call him. He has called Kim an "awesome guy."
Rodman's trip comes as the rival Koreas pursue diplomacy meant to restart several cooperative projects that were scrapped as tensions rose in recent years, including the jointly run factory complex in the North Korean border city of Kaesong. While there is skepticism about Pyongyang's intentions, the warming ties have been welcomed in Seoul.
Outside analysts have said Pyongyang is likely using Bae as bait to win diplomatic concessions in a standoff over its nuclear weapons program. North Korea denies this.
Pyongyang accuses Bae of trying to establish an anti-Pyongyang base in the North. Friends say Bae was based in a Chinese border city and traveled frequently to North Korea both as a tour operator and to feed orphans.
At least five other Americans have been detained in North Korea since 2009. The others were eventually allowed to leave without serving out their terms, some after clemency missions by prominent Americans, including former presidents Bill Clinton and Jimmy Carter.
Just this past weekend, a planned trip by Robert King, the U.S. envoy for North Korean human rights, fell through after Pyongyang said it couldn't forgive the inclusion of U.S. nuclear capable bombers in recently concluded U.S.-South Korean military drills.
Talks aimed at getting the North to give up what's estimated to be a small cache of nuclear devices, and involving the Koreas, the United States, Japan, China and Russia, collapsed in early 2009. Pyongyang says its weapons are intended to protect itself from a hostile Washington.