POLITICAL dissident Wang Juntao has been moved from a prison to a civilian hospital, winning a long struggle to get medical attention for his serious illnesses. Wang, labelled by the authorities as a ''black hand'' behind the 1989 anti-Government protests, was moved to a civilian hospital early this week, according to Chinese sources. However, the Government has not revealed Wang's precise location to keep both Chinese and foreigners from trying to see the dissident, who is serving a 13-year prison sentence on charges of subversion. Wang's wife, Hou Xiaotian, is scheduled to make her monthly visit tomorrow, but may well be ordered to keep the hospital's name secret if she wants to maintain such rights. Suffering from a number of illnesses, Wang had repeatedly demanded treatment in a civilian hospital, using the threat of a hunger strike to pressure the authorities. But the authorities had been just as persistent in turning down his request. The timing of Wang's transfer seems to be linked to Beijing's efforts to improve its international image in order to win the right to host the 2000 Olympics. It also comes just ahead of a major international human rights conference in Vienna. It is not clear how long Wang will be allowed to stay in the hospital. Some dissidents speculated it could be for an extended period so as to avoid further international attention on China's human rights situation, while others believed he would be sent back to prison after being cured. Expenses for his treatment were being paid by the Government, sources said. Wang has long suffered from Hepatitis B and has also developed coronary heart disease. In addition, urine tests suggested he had contracted diabetes, cirrhosis or a kidney ailment. Since September 1991, Wang had been at the Yanqing prison hospital 80 kilometres northeast of Beijing. Earlier this year he was allowed to make brief visits to specialist hospitals in Beijing, each time for less than a day.