Two-time champion Sally Voss of Congressional birdied the 18th hole to hold off Jane Abood of Kenwood, 2 up, in the semifinals yesterday of the Women's District Golf Association Championship at Belle Haven Country Club.

Voss, winner of the WDGA title in 1978 and 1979, will play Liza Abood, Jane's sister, in the 18-hole final at 10 a.m. today. It will be a duel between two long-hitting, 23-year-old golfers.

In her semifinal yesterday, Liza Abood took the first three holes against Kim Williams of Bethesda and won, 4 and 3.

Voss, who is attending the University of California (San Francisco) Medical School, appeared to have her match well in hand against Jane Abood, 19, a Penn State student. Voss was 3 up after 11 holes but Abood won the par-5 No. 12 when Voss missed a tricky, downhill six-foot putt and took bogey.

Voss hit a 250-yard drive on the next hole and reached the green on this par-5 hole in two shots, but took three putts from 30 feet and remained 2 up. The next two holes were halved, but Abood won at No. 17 when she rammed in a 20-foot birdie putt at the par-3 hole.

On the 18th, a par-4, Abood drove into a sand trap on the left. Voss also drove left but was in the rough beyond the trap and near a forbidding tree. After Abood's second shot stopped five feet short of the green, Voss sand wedged her approach shot a foot and a half from the hole and won the match with birdie 3.

Voss, who was three under par Wednesday, yesterday was three over but not distressed. "The pins were in difficult places today," she said. "I had a tough time getting the ball close to the hole with my approach shot."

Liza Abood was reduced to tears three years ago after losing in the semifinals when Diane Rankin sank a long putt on the final green. Abood was making the lengthy putts against Williams, a 16-year-old out of Wootton High, who has been playing golf only two years.

Abood sank a 40-foot putt on the second hole to go 2 up and a 25-footer for birdie on the 13th hole to remain 4 up.