How about something like this:
Option Explicit
Sub testme01()
Dim myRng As Range
Dim myRow As Range
With Worksheets("sheet1")
Set myRng = .Range("a5:AD661")
For Each myRow In myRng.Rows
With myRow
.Sort Key1:=.Cells(1), Order1:=xlAscending, Header:=xlNo, _
OrderCustom:=1, MatchCase:=False,
Orientation:=xlLeftToRight
End With
Next myRow
End With
End Sub
(Adjust those columns to match your data--I used a5:AD661).