A Baltimore man was sentenced yesterday in the city's Circuit Court to 20 years in prison for shooting at two police officers - wounding one of them, along with a teen-ager they had just arrested.

Donnell Ward, 28, of the 1200 block of Treeleaf Court opened fire on plainclothes Officers Willie D. Grandy and Michael Coleman in March last year as they arrested a 17-year-old on charges of selling marijuana in the 700 block of Wharton Court, prosecutors said. Grandy and the youth were wounded.

A jury failed to reach a verdict in Ward's case in May, resulting in a mistrial. The wounded youth had identified Ward as the person who shot himself and Grandy, prosecutors said, but at both trials he recanted that account. But Ward was convicted in a September retrial of second-degree assault and reckless endangerment.