Něco jako tohle:

Private Sub Worksheet_Change(ByVal Target As Range)
Dim Radek As Long

Application.ScreenUpdating = False

If Target.Column = 2 Then
    Radek = Cells(Rows.Count, "B").End(xlUp).Row
    Range("A1:B" & Radek).Sort Key1:=Range("B1"), Order1:=xlDescending, Header:= _
        xlGuess, OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, _
        DataOption1:=xlSortNormal
End If
Application.ScreenUpdating = True
End Sub