也许你可以用这种方式循环不同的会话：

' Cycle through the open SAP GUI sessions and check which is in the same 
' system running the matching transaction
For il = 0 To application.Connections.Count - 1
    Set W_conn = application.Connections(il + 0)
    For it = 0 To W_conn.Sessions.Count - 1
        Set W_Sess = W_conn.Sessions(it + 0)
        If W_Sess.Info.SystemName = "NPL" Then
            Set objConn = W_conn
            Set objSess = W_Sess
            Exit For
        End If
    Next
Next

有关属性和方法的详细信息，请参阅文档：

• GuiApplication Object
• 房产Connections（别名：类型为GuiComponentCollection的
• GuiConnection Object
• 房产Sessions（别名：类型为GuiComponentCollection的
• GuiSession Object
• GuiSessionInfo类型的属性Info
• GuiComponentCollection Collection
• 方法Item，性质Count（注意：表示application.Connections(x)与application.Connections.Item(x)相同
• GuiSessionInfo Object
• 属性SystemName、Client、User、Language等

import win32com.client

SapGuiAuto = win32com.client.GetObject("SAPGUI")
application = SapGuiAuto.GetScriptingEngine
connection = application.Children(0)
session = connection.Children(0)

session.findById("wnd[0]").maximize()
session.findById("wnd[0]/tbar[0]/okcd").text = "VA03"
session.findById("wnd[0]").sendVKey(0)


SapGuiAuto = win32com.client.GetObject("SAPGUI")
application= SapGuiAuto.GetScriptingEngine
connection = application.Children(0)
session2 = connection.Children(1)

session2.findById("wnd[0]").maximize()
session2.findById("wnd[0]/tbar[0]/okcd").text = "BD84"
session2.findById("wnd[0]").sendVKey(0)