Ryan Clark from Hartlepool and Edinburgh's Ross Muir were the other two players who will take up a main tour place for 2013/14 and 2014/15. All four will play on the pro circuit for the first time.
Saif, age 30, beat Jamie Clarke 4-1 in the final round with a top break of 57 to become the first snooker professional from Qatar.
"I have been waiting fror this day for a long time, it makes me very proud to be the first pro snooker player from my country," said Saif, who represented Qatar at the 2010 Asian Games. "I have played very well this week and won a few close matches.
"I just hope I can play well on the main tour, keep my place, enjoy myself and do well for my country. Snooker is becoming popular now in Qatar and hopefully my success can help. It would be great to have a ranking event there," added Saif, who names his favourite player as Ronnie O'Sullivan.
Ursenbacher, a gifted teenager from Rheinfelden who turned 17 just last month, played superbly throughout the event, losing just one frame in four matches and scoring a top break of 140. Earlier today he beat nine-time Ladies World Champion Reanne Evans 4-1, then in the final round he saw off experienced former pro Paul Wykes 4-0.
Clark, age 20, became the second player from the North East of England to make it through Q School this year, after event one graduate Elliot Slessor. He beat Zak Surety 4-1 in the final round with a top run of 70.
Scotland's Muir, age 17, beat David Morris 4-0 in his last match with a top break of 76.
Ball by ball scoring and results from tournaments