-bash: sh: command not found

I wanted to switch the shell to sh so I typed:

rakinar2@hotspot:~$ sh

But it says:

-bash: sh: command not found

How do I fix that?

Note: test -e /bin/sh returns 1!

EDIT:

ls -l /bin/{,ba,da}sh returns:

-rwx------ 1 rakinar2 rakinar2 563684 May 5 18:27 /bin/bash

echo $PATH returns:

/bin:/usr/bin:/usr/local/bin:/sbin

And sudo apt list --installed | grep "dash" returns 0|1

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