Einarsson opened the scoring in the 11th minute, Jules Chopin being credited with the assist. Niall Cousens found the net in the 23rd minute, and Einarssson scored again in the 40th minute with Milda Mehrabi getting an assist.
The Thunderbirds scored an unassisted goal in the 57th minute, this one by Navid Mashinchi, and Kyle Sohi got a goal in the 81st minute on a pass from Otis Sandhu.
WWU was limited to four shots by the UBC defense, two by Chad Radulovich (So., San Ramon, CA/California).
UBC had 24 shots, Viking goalkeeper Keegan Rogers (Sr., Portland, OR/Portland Christian) making seven saves in the first half and Nico Terentjev two in the second period.
WWU, which lost 2-0 in its opening exhibition with defending Western Athletic Conference champion and this year's league favorite Seattle University on Aug. 23, competes its pre-season exhibition schedule Saturday (2 p.m.), playing host to Trinity Western University.
Tuesday, Aug. 26, 2014 Vancouver, B.C., Thunderbird Park, UBC campus
British Columbia 5, Western Washington 0
Scoring - 1. UBC Sean Einarsson (Jules Chopin), 10:40; 2. UBC Niall Cousens (Unassisted), 22:19; 3. UBC Sean Einarsson (Milad Mehrabi), 39:19; 4. UBC Navid Mashinchi (Unassisted), 56:35; 5. UBC Kyle Sohi (Otis Sandhu), 80:27.
Shots - WWU 4, UBC 24. Saves - WWU 10 (Keegan Rogers 7, Nico Terentjev 2, Team 1); UBC 1 (Ante Boskovic 1) Corner kicks - WWU 4, UBC 4 Fouls - WWU 6, UBC 6 Attendance: 783.
Garrett Strawn Named to Academic All-District Team
Strawn voted as one of four GNAC honorees, advances to Academic All-America ballot
Five Vikings Earn Men's Soccer All-GNAC Honors
Anthony Dean and Tyler Visten named unanimous First Team All-GNAC selections for WWU
WWU Ties No. 15 Simon Fraser 0-0 After Double OT
WWU ties GNAC champion Simon Fraser in Burnaby for second straight year
Men's Soccer Edged 2-1 by Visiting Concordia
Cavaliers score twice early, Vikings net goal on penalty kick by Anthony Dean
WWU Game at Simon Fraser Postponed Due to Snow
Snow at Terry Fox Field in Burnaby forces reschedule of Thursday's game to Sunday
WWU Heads to No. 15 Simon Fraser, Hosts Concordia
Vikings enter final week of GNAC schedule battling for conference title
Men's Soccer Falls 2-0 at MSU Billings
Yellowjackets score in 66th minute to take lead, add late goal in final minute of game
Record Eleven Vikings Earn GNAC All-Academic Honors
WWU sets program record for GNAC All-Academic honorees, Olney earns third honor
WWU Battles to Scoreless Tie at Northwest Nazarene
Tyler Visten ties career high with 10 saves, including a penalty kick save during first half
WWU Travels to Northwest Nazarene, MSU Billings
The Vikings are tied for 2nd in the GNAC with four conference games remaining
Men's Soccer Falls 3-2 at Saint Martin's
WWU edged by one-goal margin for second straight game, Dean and Olney score for Vikings
Vikings Travel to Face Saint Martin's on Thursday
WWU (6-3-3, 5-1-1 GNAC) begins a stretch of four consecutive road contests this week
WWU Edged 1-0 on Golden Goal in Double OT by SFU
Simon Fraser scores in 109th minute as Vikings suffer first defeat since Sept. 2
WWU Shuts Out MSU Billings 2-0, Extends Unbeaten Streak
Vikings score in 81st and 90th minutes, extend unbeaten streak to nine games
WWU to Host MSU Billings, No. 16 Simon Fraser
Vikings (4-0-1 GNAC) look to continue strong start to conference schedule at home