You cannot protect/unprotect more than one sheet at once, have you tried the following:
Worksheets("Sheet1").Protect Password:="password", DrawingObjects:=True, Contents:=True, Scenarios:=True
Worksheets("Sheet1").Unprotect ("password")
Worksheets("Sheet2").Protect Password:="password", DrawingObjects:=True, Contents:=True, Scenarios:=True
Worksheets("Sheet2").Unprotect ("password")
Edit as needed.