Aberdeen winger Scott Wright has signed a three-year contract extension.
West Brom boss Alan Irvine has admitted he is keen to add another striker this summer after already signing Brown Ideye.
The 24-year-old, who can feature at left-back or centre-half, has left Falkirk on a Bosman free transfer.
Scobbie had spent his whole career with Falkirk but has now opted to move to the top-flight.
He will compete with Callum Davidson for the left-back berth at McDiarmid Park.
Falkirk have moved quickly to replace him, signing Luke Leahy from English non-league outfit Rugby Town.